<?php

$grades = array("一","二","三","四","五","六","七","八","九","十","十一","十二",);
?>
<form>
    <select name="grade">
        <?php foreach($grades as $value) :?>
        <option value="<?php echo $value; ?>">第<?php echo $value; ?>周</option>
        <?php endforeach ; ?>
        
    </select>
</form>

